Year | Value | 2015 | 60.651144781345 | 2014 | 58.826711053956 | 2013 | 60.679903446446 | 2012 | 61.291483225189 | 2011 | 63.015290659122 | 2010 | 65.184528014959 | 2009 | 64.525558428703 | 2008 | 64.956024055874 | 2007 | 66.528377571256 | 2006 | 64.489608485523 | 2005 | 64.898229957601 | 2004 | 64.845202756601 | 2003 | 64.643803082042 | 2002 | 63.586982139922 | 2001 | 64.047674738865 | 2000 | 64.344893531785 | 1999 | 68.770383311481 | 1998 | 71.55901293073 | 1997 | 72.662824621505 | 1996 | 72.460595361816 | 1995 | 71.627761334221 | 1994 | 68.58546924388 | 1993 | 71.911740418002 | 1992 | 75.226387625576 | 1991 | 74.749925065747 | 1990 | 75.223840385411 | 1989 | 74.828120369466 | 1988 | 75.412353128426 | 1987 | 75.417710216828 | 1986 | 75.06276190708 | 1985 | 77.411001943327 | 1984 | 79.940435694498 | 1983 | 80.040389912832 | 1982 | 80.300809097781 | 1981 | 81.700721491064 | 1980 | 82.529124745448 | 1979 | 85.224605061875 | 1978 | 86.315959414947 | 1977 | 86.316424850848 | 1976 | 85.426043970115 | 1975 | 84.539332111737 | 1974 | 84.05850504187 | 1973 | 83.408037996659 | 1972 | 82.084998971454 | 1971 | 81.134421119163 |
|